1213556455 has 16 divisors (see below), whose sum is σ = 1466920800. Its totient is φ = 963763200.

The previous prime is 1213556447. The next prime is 1213556471. The reversal of 1213556455 is 5546553121.

It is a happy number.

It is not a de Polignac number, because 1213556455 - 2³ = 1213556447 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1009855 + ... + 1011055.

It is an arithmetic number, because the mean of its divisors is an integer number (91682550).

Almost surely, 2^1213556455 is an apocalyptic number.

1213556455 is a deficient number, since it is larger than the sum of its proper divisors (253364345).

1213556455 is a wasteful number, since it uses less digits than its factorization.

1213556455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2514.

The product of its digits is 90000, while the sum is 37.

The square root of 1213556455 is about 34836.1371997528. The cubic root of 1213556455 is about 1066.6452283560.

The spelling of 1213556455 in words is "one billion, two hundred thirteen million, five hundred fifty-six thousand, four hundred fifty-five".